Joint Routing, Relay
Selection, and Dynamic Spectrum Allocation in Cognitive Radio Ad Hoc Networks
Tommaso Melodia
State University of New York at Buffalo
Friday, February 26, 3pm
Location: BAB024 (Bahen Centre Basement)
Abstract:
In spatially distributed
cognitive radio networks with decentralized control, the spectrum occupancy is
location-dependent, and the receiver interference profile may thus vary at
each intermediate node in a multi-hop path.
For this reason, the problem of joint routing and dynamic spectrum allocation
is considered in this talk under realistic interference models. With the
objective of maximizing the network throughput, a cross-layer opportunistic
spectrum access and dynamic routing algorithm, called ROSA (ROuting and
Spectrum Allocation algorithm) is discussed. Through local control actions,
ROSA aims at maximizing the network throughput by jointly controlling routing,
dynamic spectrum allocation, scheduling, and transmit power control. ROSA is
shown through numerical model-based evaluation and discrete-event packet-level
simulations to outperform baseline solutions leading to a high throughput, low
delay, and fair bandwidth allocation.
The talk will then address the following fundamental question: do cooperative
communications capabilities (in their virtual multiple-input-single-output
variant) provide performance improvements in an uncoordinated and dynamic
environment with spectrum-agile devices, once benefits and drawbacks are
considered and correctly accounted for? Strategies for joint routing, relay
selection, and dynamic spectrum allocation are then proposed, discussed, and
evaluated.
Bio:
Tommaso
Melodia is an Assistant Professor with the Department of Electrical Engineering
at the University at Buffalo, The State University of New York (SUNY), where he
directs the Wireless Networks and Embedded Systems Laboratory. He received his
Ph.D. in Electrical and Computer Engineering from the Georgia Institute of
Technology in June 2007. He had previously received his `Laurea' (integrated
B.S. and M.S.) and Doctorate degrees in Telecommunications Engineering from the
University of Rome "La Sapienza" Rome, Italy, in 2001 and 2005, respectively. He
coauthored a paper that was was recognized as the Fast Breaking Paper in the
field of Computer Science for February 2009 by Thomson ISI Essential Science
Indicators. He is an Associate Editor for the Computer Networks (Elsevier)
Journal, Transactions on Mobile Computing and Applications (ICST) and for the
Journal of Sensors (Hindawi). He serves in the technical program committees of
several leading conferences in wireless communications and networking, including
IEEE Infocom, ACM Mobicom, and ACM Mobihoc. He was the technical co-chair of the
Ad Hoc and Sensor Networks Symposium for IEEE ICC 2009. His current research
interests are in modeling and optimization of multi-hop wireless networks,
cross-layer design and optimization, wireless multimedia sensor networks,
underwater acoustic networks, and cognitive radio networks.
Host of Talk:
Jörg Liebeherr (jorg@comm.toronto.edu)